IS32LT3958-ZLA3-TR

{
  "schema_version": 1,
  "type": "component",
  "slug": "is32lt3958-zla3-tr",
  "title": "IS32LT3958-ZLA3-TR",
  "brief": "ISSI Integrated Silicon Solution LED Drivers, eTSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led drivers",
    "is32lt3958-zla3-tr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "IS32LT3958-ZLA3-TR",
    "manufacturer": "ISSI Integrated Silicon Solution",
    "package": "eTSSOP-20",
    "pin_count": 21,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603606417735897088",
    "parts": {
      "symbol": "is32lt3958-zla3-tr.kicad_sym",
      "footprint": "is32lt3958-zla3-tr.kicad_mod",
      "model_3d": "is32lt3958-zla3-tr-hero.glb",
      "model_3d_plain": "is32lt3958-zla3-tr.glb",
      "model_3d_step": "is32lt3958-zla3-tr-etched.step",
      "model_3d_step_plain": "is32lt3958-zla3-tr.step",
      "lbr": "is32lt3958-zla3-tr.lbr"
    },
    "distributor_links": {
      "lcsc": "C20342582",
      "mouser": "870-IS32LT3958ZLA3TR"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T23:24:24Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 539 calls left today"
      },
      "mouser": {
        "pn": "870-IS32LT3958ZLA3TR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC",
        "type": "power_in",
        "description": "The power supply pin."
      },
      {
        "number": "2",
        "name": "PWM/EN",
        "type": "input",
        "description": "External PWM dimming and enable pin: pull high to enable and low to disable the IC, do not let it float, and connect it to VCC via a resistor (recommended 10kΩ) if not used."
      },
      {
        "number": "3",
        "name": "FAULTB",
        "type": "output",
        "description": "Open-drain active-low fault reporting pin, with a recommended 47kΩ pull-up resistor to the required logic level voltage."
      },
      {
        "number": "4",
        "name": "FRQSS",
        "type": "passive",
        "description": "Spread-spectrum frequency setting pin: a capacitor to ground sets the dither frequency, and connecting it directly to ground disables the function."
      },
      {
        "number": "5",
        "name": "COMP",
        "type": "passive",
        "description": "Loop compensation pin."
      },
      {
        "number": "6",
        "name": "RT/SYNC",
        "type": "input",
        "description": "An external resistor to ground sets the operating frequency, and an external clock applied to this pin can synchronize two or more ICs."
      },
      {
        "number": "7",
        "name": "ICTRL",
        "type": "input",
        "description": "Analog dimming pin with a range of 0.06V to 2V (zero current below 0.06V, full current between 2V and 5V), which must not float and should be decoupled with a 10nF X7R capacitor placed close to the pin."
      },
      {
        "number": "8",
        "name": "ADJR",
        "type": "input",
        "description": "Analog dimming pin with identical function to ICTRL."
      },
      {
        "number": "9",
        "name": "SS",
        "type": "passive",
        "description": "Soft-start time programming pin: a capacitor from this pin to GND sets the soft-start time, and the pin must not float."
      },
      {
        "number": "10",
        "name": "PWMDC",
        "type": "input",
        "description": "Internal PWM generator duty-cycle setting pin: 0V to 3V enables the internal PWM generator and sets the duty cycle, 3V to 5V disables it, and the pin must never float or be connected directly to VDD."
      },
      {
        "number": "11",
        "name": "PWMFR",
        "type": "passive",
        "description": "Internal PWM generator frequency pin: a resistor from this pin to GND sets the internal PWM frequency (100Hz to 1kHz)."
      },
      {
        "number": "12",
        "name": "IMON",
        "type": "output",
        "description": "Output current reporting pin with VIMON = 8 × (VISP − VISN), internally clamped to VIMON_CLP (typical 3.35V), and left floating if unused."
      },
      {
        "number": "13",
        "name": "OV",
        "type": "input",
        "description": "Output voltage detection pin: a resistor divider from the output to GND sets the output overvoltage and undervoltage protection thresholds."
      },
      {
        "number": "14",
        "name": "ISN",
        "type": "input",
        "description": "LED current sense amplifier negative input."
      },
      {
        "number": "15",
        "name": "ISP",
        "type": "input",
        "description": "LED current sense amplifier positive input."
      },
      {
        "number": "16",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin; the exposed thermal pad must be soldered to a large GND copper plane."
      },
      {
        "number": "17",
        "name": "CS",
        "type": "input",
        "description": "External NMOS switch current sense for control loop and overcurrent protection, connected through a resistor to ground."
      },
      {
        "number": "18",
        "name": "DIMOUT",
        "type": "output",
        "description": "Buffered PWM signal driving the LED string disconnect NMOS, with its high level set by the internal VDD LDO, also used for fault protection, and left floating if not used."
      },
      {
        "number": "19",
        "name": "GATE",
        "type": "output",
        "description": "Gate drive to the external power NMOS, switching between VDD and GND."
      },
      {
        "number": "20",
        "name": "VDD",
        "type": "power_out",
        "description": "Internal LDO output that needs a low-ESR 1µF capacitor placed close to the pin, and is not meant to power any external circuit."
      },
      {
        "number": "21",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The exposed thermal pad is not given a pin number in the datasheet pin table or the package drawing ; The pin-configuration top-view text on page 5 is scrambled, so the number-to-name mapping was taken ; Pin types are inferred from the functional descriptions because the datasheet does not classify pins",
          "exposed pad 21 added from the footprint"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0745,
        "at": "2026-10-09T23:21:50"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603606417735897088",
        "pages": 35,
        "sha256": "66f84e58b57e6565",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "is32lt3958-zla3-tr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "7a0251e13b07dd6c1b086d69741c02849106cddb90d1e188d1f17dfcba69e646",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "is32lt3958-zla3-tr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d641547e8902428d9236aba31f986e83a6edfe7ae22df01c1dc1c0c6fc063179",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ISSI Integrated Silicon Solution",
      "Package": "eTSSOP-20",
      "Category": "LED Drivers",
      "Pins": "21"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "is32lt3958-zla3-tr"
  ],
  "discovery_pitch": "IS32LT3958-ZLA3-TR (ISSI Integrated Silicon Solution) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
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    "is32lt3958-zla3-tr.kicad_mod",
    "is32lt3958-zla3-tr.glb",
    "is32lt3958-zla3-tr.step",
    "is32lt3958-zla3-tr.lbr",
    "docs/hero.png",
    "docs/is32lt3958-zla3-tr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "is32lt3958-zla3-tr-hero.glb",
    "is32lt3958-zla3-tr-hero.overlay.json"
  ],
  "visibility": {
    "public": true
  }
}